What's the best way to calculate the size of a directory in .NET?

Question

I've written the following routine to manually traverse through a directory and calculate its size in C#/.NET:

  protected static float CalculateFolderSize(string folder) {     float folderSize = 0.0f;     try     {         //Checks if the path is valid or not         if (!Directory.Exists(folder))             return folderSize;         else         {             try             {                 foreach (string file in Directory.GetFiles(folder))                 {                     if (File.Exists(file))                     {                         FileInfo finfo = new FileInfo(file);                         folderSize += finfo.Length;                     }                 }                  foreach (string dir in Directory.GetDirectories(folder))                     folderSize += CalculateFolderSize(dir);             }             catch (NotSupportedException e)             {                 Console.WriteLine("Unable to calculate folder size: {0}", e.Message);             }         }     }     catch (UnauthorizedAccessException e)     {         Console.WriteLine("Unable to calculate folder size: {0}", e.Message);     }     return folderSize; }  

I have an application which is running this routine repeatedly for a large number of folders. I'm wondering if there's a more efficient way to calculate the size of a folder with .NET? I didn't see anything specific in the framework. Should I be using P/Invoke and a Win32 API? What's the most efficient way of calculating the size of a folder in .NET?

Answer 1

No, this looks like the recommended way to calculate directory size, the relevent method included below:

public static long DirSize(DirectoryInfo d)  {         long size = 0;         // Add file sizes.     FileInfo[] fis = d.GetFiles();     foreach (FileInfo fi in fis)      {               size += fi.Length;         }     // Add subdirectory sizes.     DirectoryInfo[] dis = d.GetDirectories();     foreach (DirectoryInfo di in dis)      {         size += DirSize(di);        }     return size;   } 

You would call with the root as:

Console.WriteLine("The size is {0} bytes.", DirSize(new DirectoryInfo(targetFolder)); 

...where targetFolder is the folder-size to calculate.

Answer 2

DirectoryInfo dirInfo = new DirectoryInfo(@strDirPath); long dirSize = await Task.Run(() => dirInfo.EnumerateFiles( "*", SearchOption.AllDirectories).Sum(file => file.Length));